Buried in the attic is a Heathkit green-phosphor scope which is designed to be part of a stereo rig.
it is capable of accepting line-level audio L and R for display and manipulation on the scope face . Furthermore, it has got a built-in sine-wave tone gen from about 50Hz through 15kHz or so.
Sometimes I bust it out and use it on my main system just for laughs.
This one reminds me of it in a way.
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